Energy Conservation Violation

[thinhnghiem]

First of all, I would like to say that this model is NOT a perpetual motion. It will stop eventually. What I want to say here is that the output useful work seems to be greater than input energy

My system consists of 2 elements. Each element is a cylinder put on an axle. There are two permanent magnets stuck on each cylinder, with their north poles are faced outside. In the youtube clip that I will show you below, you can see the magnets of the first element are painted in blue, while those of the second one are crossed with X.

I turn the cylinders slightly so that the north poles of the magnets are faced each other. Then, the thrust between magnets make the cylinders rotate.

A single cylinder on an axle itself is not the system. It is an element of the system, which consists of 2 at all. Therefore, the thrust between magnets is not external force which affect system. It is comprehended as internal force between 2 elements of the system. The thrust from the first cylinder makes the second rotate, and the thrust from the second, in its turn, make the first rotate. Each component act as the cause to make the other rotate, and it acquires the affect from the other to rotate.

While the input work of the system originates from a small force making cylinders moving short arc, and make magnets facing each other, the output dynamic energy is much higher. You can see in the clip that both cylinders rotate many circles, which create output useful work much greater than the work to make the magnets facing each other.

 

Here is the link of my clip

http://www.youtube.com/watch?v=GQUPaHE0vCg&feature=youtu.be

 

Your comments are welcomed to determine that if energy conservation is violated in this case or not

Thanks

Thinh Nghiem from Vietnam

[Doctordick]

There is no evidence that energy conservation is violated in your model.  What is happening is the fact that you are entirely omitting the energy embedded in the distortion of the relevant magnetic fields. You seem to believe that the only energy in the system is the kinetic energy (that is "energy of motion") of the cylinders themselves. In essence, it takes a force to set the cylinders into your opening circumstance.  Applying that force to rotate the cylinders into that opening position puts energy into the system. That energy produces motion as the magnetic fields are relieved of their distortion.  Then the kinetic energy (the energy of that rotation) ends up creating a new distortion in the magnetic fields. Such a transfer continues until the original energy required to set the cylinders into that opening circumstance is dissipated by friction with the air around the cylinders and everything stops with the least possible magnetic distortion.

 

Magnetic field properties are much more complicated than what you seem to have in mind.  If you are really interested in the subject, you need to find a physics text on electro-magnetic phenomena.  Perhaps you could find a copy of "Classical Electrodynamics" by John David Jackson.  I am quite old any my personal books date from the 1960's and I am pretty ignorant of modern texts.

 

Have fun -- Dick

[thinhnghiem]

Thank you Dick

[Pmb]

You have this mixed up. You're confusing perpetual motion with a perpetual motion machine. What you think you've described is a perpetual motion machine. A common misconception in physics is that a perpetual motion machine is something which never stops. This is untrue. The laws of physics allow systems for which the motion of its parts don't stop. The solar system is a perfect example as is the motion of a free particle. A perpetual motion machine is something which creates more energy than it uses.